@zwol @ajn142 @johntimaeus Catching up on the thread I see you're using box fans, I see someone else pointing out quite rightly that box fans are more a "Blow air around person to cool them down and it doesn't matter very much which direction" sort of fan rather than a "Blow a lot of air in a particular direction as intake/exhaust" sort of fan, in that the fan is round and the frame is square and a lot of air gets sucked in through the corners of the blow side.
The rich-man's solution is a whole lotta money on a whole-house fan, the raccoon solution is duct tape
